I don't know whether a calculator is provided... but to be well-prepared for the exam, you should be able to subnet in your head (without the crutch of a calculator), to the point that it's second nature to you. This won't be the last exam you see subnetting on, so you'd be well-served to master the art. 
BosonMichael
MCSE+I, MCSE: Security, MCDST, MCDBA, OCP, CCNP, CCDP, CNE, SCSA, Security+, Linux+, Server+, Network+, A+
Served proudly, US Army, 98C Intelligence Analyst, '89-'92
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